Quaternized magnetic microspheres for the efficient removal of reactive dyes

Shuang, Chendong; Li, Penghui; Li, Aimin; Zhou, Qing; Zhang, Mancheng; Zhou, Yang

doi:10.1016/j.watres.2012.05.052

Cited by 147 publications

(64 citation statements)

References 37 publications

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“…are restricted to aromatic rings. The presence of sulfonate groups of H-acid results in a negative charge on molecules under both acidic and basic conditions appears anion-exchange with tertiary amine resins positively charged [25]. As shown in Fig.…”

Section: Adsorption Kineticsmentioning

confidence: 95%

A comparative study on the adsorption of 8-amino-1-naphthol-3,6-disulfonic acid by a macroporous amination resin

Zhang

Wang

Yang

et al. 2016

Chemical Engineering Journal

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Section: Adsorption Kineticsmentioning

confidence: 95%

A comparative study on the adsorption of 8-amino-1-naphthol-3,6-disulfonic acid by a macroporous amination resin

Zhang

Wang

Yang

et al. 2016

Chemical Engineering Journal

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“…where q e (mg/g) is the equilibrium sorption of Pb(II), q m (mg/g) is the maximum Pb(II) sorption corresponding to complete monolayer coverage, K L (l/mg) denotes the affinity of binding sites and K F and 1/n indicate the sorption capacity and intensity, respectively (Shuang et al 2012). The equilibrium data fit the Langmuir model well, thus implying that sorbed Pb 2 ?…”

Section: Sorption Isothermsmentioning

confidence: 91%

A novel manganese-oxide/biochar composite for efficient removal of lead(II) from aqueous solutions

Wang

Sheng

Qiu

2014

Int. J. Environ. Sci. Technol.

119

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Biochar (BC) derived from pyrolysis of plant biomass can be used as an inexpensive adsorbent for removal of aqueous heavy metals. In the present study, amorphous hydrous manganese oxide was loaded onto BC to fabricate a novel manganese-oxide/biochar (Mn/BC) composite for further enhancing lead(II) removal by sorption from water. Mn/BC was characterized by X-ray diffraction, scanning electron microscope, and specific surface area analysis. After impregnation with 3.65 % Mn, BC raised the removal efficiency of lead(II) from 6.4 to 98.9 % at pH 5.00. This improvement is attributed to the increase in surface hydroxyls and the decrease in pH PZC (pH at the point of zero charge) of carbon. The maximum monolayer adsorption of lead(II) on Mn/BC at 298 K was five times that on BC. The smaller pseudo-second-order rate constant of Mn/BC compared with that of BC indicated that the sorption rate of Mn/BC is faster than that of BC. The calculated thermodynamic parameters implied that the sorption of lead(II) is a spontaneous and endothermic process. The results suggest that Mn/BC composite is a promising adsorbent for the efficient removal of lead(II) from water.

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“…For example, quaternized magnetic polyacrylic microspheres (referred to as NDMP resin) were synthesized and compared with MIEX resin for removal of reactive dyes. NDMP resin had a higher strong-base anion exchange capacity than MIEX resin, which resulted in greater adsorption of reactive dyes by NDMP resin than MIEX resin [84]. The NDMP resin was effectively regenerated using 10 % NaCl and showed consistent level of dye removal over 20 regeneration cycles [84].…”

Section: Comparison With Other Anion Exchange Resinsmentioning

confidence: 99%

“…NDMP resin had a higher strong-base anion exchange capacity than MIEX resin, which resulted in greater adsorption of reactive dyes by NDMP resin than MIEX resin [84]. The NDMP resin was effectively regenerated using 10 % NaCl and showed consistent level of dye removal over 20 regeneration cycles [84]. Other research has shown that electrolysis of NDMP-treated water can be used to generate chlorine (from the released chloride counterion) and disinfect the water [85].…”

Section: Comparison With Other Anion Exchange Resinsmentioning

confidence: 99%

Removal of Dissolved Organic Matter by Magnetic Ion Exchange Resin

Boyer

2015

Curr Pollution Rep

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This article provides a state-of-the-art review on the uses of magnetic ion exchange (MIEX) resin in drinking water and wastewater treatment, with emphasis on removal of dissolved organic matter (DOM) from drinking water and wastewater, regeneration efficiency, removal of inorganic and synthetic organic chemicals, comparison with other anion exchange resins, and integration with other physical-chemical processes. Through laboratory jar tests, pilot plant tests, and full-scale installations for a variety of drinking water sources, MIEX resin can achieve 30-80 % removal of dissolved organic carbon (DOC), which is often higher than alum or ferric coagulation. In addition, MIEX resin has been shown to remove hydrophilic, transphilic, and hydrophobic fractions of DOM and a wide range of molecular weight fractions of DOM. As a result, MIEX pretreatment results in substantial reductions in the formation of trihalomethanes and haloacetic acids upon chlorination. MIEX resin can achieve bromide removal in the range of 10-50 %, with higher bromide removal in waters with low DOC, low alkalinity, and low sulfate. However, there are commercially available anion exchange resins that are more selective for bromide than MIEX resin. MIEX resin has been investigated in combination with coagulation, activated carbon adsorption, membrane separation, lime softening, and ozonation. MIEX pretreatment has been shown to reduce downstream chemical requirements and improve the operation of downstream processes. This is most evident for coagulation and ozonation where the coagulant dose can be reduced by 50-75 % and the ozone concentration can be increased by 40-65 %. In general, MIEX pretreatment shows minor reductions in membrane fouling. Future research should continue to investigate the integration of MIEX treatment with other processes.

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Quaternized magnetic microspheres for the efficient removal of reactive dyes

Cited by 147 publications

References 37 publications

A comparative study on the adsorption of 8-amino-1-naphthol-3,6-disulfonic acid by a macroporous amination resin

A comparative study on the adsorption of 8-amino-1-naphthol-3,6-disulfonic acid by a macroporous amination resin

A novel manganese-oxide/biochar composite for efficient removal of lead(II) from aqueous solutions

Removal of Dissolved Organic Matter by Magnetic Ion Exchange Resin

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